cuishark will crush if i resize the terminal window every time.

[shawvi]

• my system information:
  4.8.0-54-generic #57~16.04.1-Ubuntu SMP Wed May 24 16:22:28 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

• exception information
  rminate called after throwing an instance of 'slankdev::exception' what(): poll

thx

[Hiroki SHIROKURA]

#7 fix the crush when it resized the the terminal window.
Until now, I didn't support that behavior, @gtalis corresponded.